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<div class="title">proto_maom.h</div>  </div>
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<a href="proto__maom_8h.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;<span class="comment">/*****************************</span></div>
<div class="line"><a name="l00002"></a><span class="lineno">    2</span>&#160;<span class="comment">proto_maom.h &lt;---U protocol.h</span></div>
<div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160;<span class="comment">implements massey-omura </span></div>
<div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;<span class="comment">transfer protocol.</span></div>
<div class="line"><a name="l00005"></a><span class="lineno">    5</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160;<span class="comment">The INITIATOR estabilishes the connection and determines</span></div>
<div class="line"><a name="l00007"></a><span class="lineno">    7</span>&#160;<span class="comment">the parameters that will be used during the communication.</span></div>
<div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160;<span class="comment">Given the maximum number of bytes that can be transmitted</span></div>
<div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160;<span class="comment">in a single chunk of data, it is possible to determine how</span></div>
<div class="line"><a name="l00010"></a><span class="lineno">   10</span>&#160;<span class="comment">big at least must the prime P be.</span></div>
<div class="line"><a name="l00011"></a><span class="lineno">   11</span>&#160;<span class="comment">The lower bound should be LB = 2 ^ (BUFSIZE * 8) - 1, where BUFSIZE is</span></div>
<div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160;<span class="comment">a constant value defined in protocol.h and represents the</span></div>
<div class="line"><a name="l00013"></a><span class="lineno">   13</span>&#160;<span class="comment">max size of the read buffer.</span></div>
<div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160;<span class="comment">As BUFSIZE may be a relatively big number to be used as an </span></div>
<div class="line"><a name="l00015"></a><span class="lineno">   15</span>&#160;<span class="comment">exponent (e.g. BUFSIZE = 512 -&gt; LB = 2 ^ 4096), it is necessary</span></div>
<div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160;<span class="comment">to define a much smaller max number of read bytes, such as 32.</span></div>
<div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160;<span class="comment">----------------------------------------------------------</span></div>
<div class="line"><a name="l00019"></a><span class="lineno">   19</span>&#160;<span class="comment">INITIATOR                                    RESPONDER</span></div>
<div class="line"><a name="l00020"></a><span class="lineno">   20</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160;<span class="comment">|choose prime P|</span></div>
<div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;<span class="comment">       |</span></div>
<div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;<span class="comment">|communicate P|---------------------------&gt;|receive P|</span></div>
<div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;<span class="comment">       |                                        |</span></div>
<div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160;<span class="comment">|choose Ei in Z*(P-1)|                     |choose Er in Z*(P-1)|</span></div>
<div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;<span class="comment">       |                                        |</span></div>
<div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160;<span class="comment">|calculate Di = Ei^(-1)|                   |calculate Dr = Er^(-1)|</span></div>
<div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;<span class="comment">       |                                        |</span></div>
<div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;<span class="comment">|compute C = M^(Ei) mod(P)|                     |</span></div>
<div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;<span class="comment">       |                                        |</span></div>
<div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;<span class="comment">|send C to RESPONDER|---------------------&gt;|receive C|</span></div>
<div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;<span class="comment">       |                                        |</span></div>
<div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;<span class="comment">       |                                   |compute D = C^(Er) mod(P)|</span></div>
<div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;<span class="comment">       |                                        |</span></div>
<div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;<span class="comment">|receive D|&lt;-------------------------------|send D back|</span></div>
<div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;<span class="comment">       |                                        |</span></div>
<div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;<span class="comment">|compute E = D^(Di) mod(P)|                     |</span></div>
<div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;<span class="comment">       |                                        |</span></div>
<div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;<span class="comment">|send E to RESPONDER|---------------------&gt;|receive E|</span></div>
<div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;<span class="comment">       |                                        |</span></div>
<div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;<span class="comment">       |                                   |compute M = E^(Dr) mod(P)|</span></div>
<div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;<span class="comment">       |                                        |</span></div>
<div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;<span class="comment">      //                                       //</span></div>
<div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;<span class="comment">----------------------------------------------------------</span></div>
<div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;<span class="comment"> *****************************/</span></div>
<div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;<span class="preprocessor">#include &lt;gmp.h&gt;</span></div>
<div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;<span class="preprocessor">#include &quot;<a class="code" href="config_8h.html">config.h</a>&quot;</span></div>
<div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;<span class="preprocessor">#include &quot;<a class="code" href="bigint_8h.html">bigint.h</a>&quot;</span></div>
<div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;<span class="preprocessor">#include &quot;<a class="code" href="protocol_8h.html">protocol.h</a>&quot;</span></div>
<div class="line"><a name="l00050"></a><span class="lineno"><a class="line" href="proto__maom_8h.html#ad363b29e635f344c0d7f34ba3ae1c418">   50</a></span>&#160;<span class="preprocessor">#define MAOM_BUFSIZE 32</span></div>
<div class="line"><a name="l00051"></a><span class="lineno"><a class="line" href="proto__maom_8h.html#a005647e225ce51fbba6ba86c851391ac">   51</a></span>&#160;<span class="preprocessor"></span><span class="preprocessor">#define DEF_BIGGER_THAN </span></div>
<div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;<span class="preprocessor"></span></div>
<div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;<span class="comment">//protocol control messages</span></div>
<div class="line"><a name="l00054"></a><span class="lineno"><a class="line" href="proto__maom_8h.html#ac4add2a227a10511e0128d63952030e8">   54</a></span>&#160;<span class="preprocessor">#define PRIME &quot;503&quot;</span></div>
<div class="line"><a name="l00055"></a><span class="lineno"><a class="line" href="proto__maom_8h.html#a84b5d2ca7749fc5ba9485656471d9dea">   55</a></span>&#160;<span class="preprocessor"></span><span class="preprocessor">#define ENCODED_A &quot;510&quot;</span></div>
<div class="line"><a name="l00056"></a><span class="lineno"><a class="line" href="proto__maom_8h.html#a38cabafaecc9a13fd128e609070ed082">   56</a></span>&#160;<span class="preprocessor"></span><span class="preprocessor">#define ENCODED_B &quot;520&quot;</span></div>
<div class="line"><a name="l00057"></a><span class="lineno"><a class="line" href="proto__maom_8h.html#a5db541e77a730177a6fd898a81613340">   57</a></span>&#160;<span class="preprocessor"></span><span class="preprocessor">#define ENCODED_C &quot;530&quot;</span></div>
<div class="line"><a name="l00058"></a><span class="lineno"><a class="line" href="proto__maom_8h.html#aba06df1ffcca30cdc26912bd5521b40d">   58</a></span>&#160;<span class="preprocessor"></span><span class="preprocessor">#define INTEGER_SIZE &quot;500&quot;</span></div>
<div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;<span class="preprocessor"></span></div>
<div class="line"><a name="l00060"></a><span class="lineno"><a class="line" href="proto__maom_8h.html#a243ffd155f48f81682c2c6364e2464ed">   60</a></span>&#160;<span class="preprocessor">#define INTEGER_SIZE_LEN 3</span></div>
<div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;<span class="preprocessor"></span></div>
<div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;<span class="comment">//function names</span></div>
<div class="line"><a name="l00063"></a><span class="lineno"><a class="line" href="proto__maom_8h.html#a14ded244c47bbba850a8a4be6d16c7e3">   63</a></span>&#160;<span class="preprocessor">#define MODULE_NAME &quot;proto_maom.c:&quot;</span></div>
<div class="line"><a name="l00064"></a><span class="lineno"><a class="line" href="proto__maom_8h.html#ac900f7f4cbb8ade051915b56180eb89d">   64</a></span>&#160;<span class="preprocessor"></span><span class="preprocessor">#define THROW (FUNCNAME, MESSAGE) {halt (#MODULE_NAME ## #FUNCNAME, #MESSAGE)} </span></div>
<div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;<span class="preprocessor"></span></div>
<div class="line"><a name="l00066"></a><span class="lineno"><a class="line" href="structmaom__kit__t.html">   66</a></span>&#160;<span class="keyword">typedef</span> <span class="keyword">struct </span></div>
<div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;{</div>
<div class="line"><a name="l00068"></a><span class="lineno"><a class="line" href="structmaom__kit__t.html#aba84e227126f9481f3f1a07737f563c2">   68</a></span>&#160;  mpz_t <a class="code" href="structmaom__kit__t.html#aba84e227126f9481f3f1a07737f563c2">prime</a>;</div>
<div class="line"><a name="l00069"></a><span class="lineno"><a class="line" href="structmaom__kit__t.html#aa5aee922f3a9ee20721aa8356789d9d4">   69</a></span>&#160;  mpz_t <a class="code" href="structmaom__kit__t.html#aa5aee922f3a9ee20721aa8356789d9d4">encode_key</a>;</div>
<div class="line"><a name="l00070"></a><span class="lineno"><a class="line" href="structmaom__kit__t.html#a11a6f659252e61e4fd7f4fff1f832dc7">   70</a></span>&#160;  mpz_t <a class="code" href="structmaom__kit__t.html#a11a6f659252e61e4fd7f4fff1f832dc7">decode_key</a>;</div>
<div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;} <a class="code" href="structmaom__kit__t.html">maom_kit_t</a>;</div>
<div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;</div>
<div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160;mpz_t <a class="code" href="proto__maom_8h.html#af53f507a4cd262cbd7c98de0b1049153">get_start_prime</a> (mpz_t bigger_than);</div>
<div class="ttc" id="proto__maom_8h_html_af53f507a4cd262cbd7c98de0b1049153"><div class="ttname"><a href="proto__maom_8h.html#af53f507a4cd262cbd7c98de0b1049153">get_start_prime</a></div><div class="ttdeci">mpz_t get_start_prime(mpz_t bigger_than)</div></div>
<div class="ttc" id="structmaom__kit__t_html_a11a6f659252e61e4fd7f4fff1f832dc7"><div class="ttname"><a href="structmaom__kit__t.html#a11a6f659252e61e4fd7f4fff1f832dc7">maom_kit_t::decode_key</a></div><div class="ttdeci">mpz_t decode_key</div><div class="ttdef"><b>Definition:</b> <a href="proto__maom_8h_source.html#l00070">proto_maom.h:70</a></div></div>
<div class="ttc" id="config_8h_html"><div class="ttname"><a href="config_8h.html">config.h</a></div></div>
<div class="ttc" id="protocol_8h_html"><div class="ttname"><a href="protocol_8h.html">protocol.h</a></div></div>
<div class="ttc" id="bigint_8h_html"><div class="ttname"><a href="bigint_8h.html">bigint.h</a></div></div>
<div class="ttc" id="structmaom__kit__t_html"><div class="ttname"><a href="structmaom__kit__t.html">maom_kit_t</a></div><div class="ttdef"><b>Definition:</b> <a href="proto__maom_8h_source.html#l00066">proto_maom.h:66</a></div></div>
<div class="ttc" id="structmaom__kit__t_html_aa5aee922f3a9ee20721aa8356789d9d4"><div class="ttname"><a href="structmaom__kit__t.html#aa5aee922f3a9ee20721aa8356789d9d4">maom_kit_t::encode_key</a></div><div class="ttdeci">mpz_t encode_key</div><div class="ttdef"><b>Definition:</b> <a href="proto__maom_8h_source.html#l00069">proto_maom.h:69</a></div></div>
<div class="ttc" id="structmaom__kit__t_html_aba84e227126f9481f3f1a07737f563c2"><div class="ttname"><a href="structmaom__kit__t.html#aba84e227126f9481f3f1a07737f563c2">maom_kit_t::prime</a></div><div class="ttdeci">mpz_t prime</div><div class="ttdef"><b>Definition:</b> <a href="proto__maom_8h_source.html#l00068">proto_maom.h:68</a></div></div>
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